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. 8, 1936. F. A. HART 2,063,737

COMBINED TYPEwRITING AND COMPUTING MACHINE Filed Jan. 24, 1951 14 Sheets-Sheet 1 INVENTOR 1 v ELM WWI/W WITNESSES Dec. 8, 1936.

F. A. HART COMBINED TYPEWRITING AND COMPUTING MACHINE Filed Jan. 24, 1931 l4 Sheets-Sheet 2 ATTORNEY Dec. 8, 1936.

F. A. HART COMBINED TYPEWRITING AND COMPUTING MACHiNE Filed Jan. 24, 1931 i4 Sheets-Sheet s fivENToR 2M 4 Ad BY /r all?! ATTORNEY lz- .(Tililiiliinmmmumu-c;

WIT NEssEs Dec. 8, 1936. F. A. HART 7 COMBINED TYPEWRITING AND COMPUTING MACHINE Fil ed Jan. 24, 1931 14 Sheets-Sheet! ns H5 H6 mvgmogi A47 ATTORNEY WITNESSES $92M 2. TQM

Dec. 8, 1936. F, A HART 2,063,737

COMBINED TYPEWRITING AND COMPUTING MACHINE Filed Jan. 24, 1931 14 Sheets-Sheet 5 WITNESSES Dec. 8, 1936. F. A. HART 2,063,737

COMBINED TYPEWRITING AND COMPUTING MACHINE Filed Jan. 24, 1931 14 Sheets-Sheet 6 WITNESSES 49M aw INVENTOR ATTOR NEY 6- F. A. HART 2,063,737 COMBINED TYPEWRITING AND COMPUTING MACHINE Filed Jafi. 24, 1931 14 Sheets-$heet 7 VIAQ INVENTOR WITNESSES $161612 5% gr j 4 fl v fzm f S ATTORNEY Deb. 8, 1936. F. A. HART COMBINED TYPEWRITING AND COMPUTING MACHINE 14 Sheets-Sheet 8 Filed Jan. 24, 1931 ATTORNEY F. A. HART Dec. 8, 1936.

COMBINED TYPEWRITING AND COMPUTING MACHINE Filed Jan. 24, 1931 14 Sheets-Sheet 9 INVENTOR W m/M BQEMJVQM:

ATTORNEY WITNESSES Dec. 8, 1 936. F, HART 2,063,737

COMBINED TYPEWRITING AND COMPUTING MACHINE Filed'Jan. 24, 1931 14 Sheets-Sheet 10 War A5? ATTORNEY Dec. 8, 1936. HART 2,063,737

COMBINED TYPEWRITING AND COMPUTING MACHINE Filed Jan. 24, 1931 14 Sheets-Sheet ll 6 Y Q G 0 INVENTOR 4 I I Wm GaLT fi m ATTORNEY F..A. HART 2,063,737

COMBINED TYPEWRITING AND COMPUTING MACHINE Filed Jan. 24. 1931 14 sheets-Shanda WITNESSES a 259 WW INVENTOR ATTORNEY Dec. 8, 1936. F. A. HART 2,063,737

CQMB INED TYPEWRITING AND COMPUTING MACHINE Filed Jan. 24, 1931 14 Sheets-Sheet 13 q- WITNESSES A INVENTOR $2M Z /w rD @MMW ATTORNEY Dec. 8, 1936. F. A. HART COMBINED TYPEWRITING AND COMPUTING MACHINE Filed Jan. 24, 1931 14 Sheets-Sheet '14 INVENTOR @L Liz-z UZMMWZL AT TOR NEY Patented Dec. 8, 1936 UNITED STATES PATENT OFFICE I COMBINED 'rvrnwnrrmc AND COMPUTING MACHINE Frederick A. Hart, New Britain, Conn., assignor to Remington Typewriter Company,

Ilion,

My invention relates to power-actuated combined typewriting and computing machines.

One of the main objects of my invention, generally stated, is to provide highly eiiicient mechanism 'of the character specified that is durable, reliable in its operation and comparatively simple in its construction.

A further object of my invention is to provide power-actuated, means which may be readily employed in conjunction with existing computing and typewriting mechanisms without materially modifying such mechanisms.

Another object of my invention is to provide improved means whereby the computing mechanism is actuated from a spring force, whereas the numeral printing instrumentalities are actuated from a positively applied motor-driven force.

A still further object of my invention is to provide means to operate the computing mechanism from an actuating member in the movement of the latter from normal position and to actuate the numeral printing mechanism by the return of said actuating member to normal position, thereby insuring a completion of the operation of the computing mechanism before the numeral printing mechanism is actuated and the carriage advanced.

Another object of my invention is to provide means for actuating the numeral printing instrumentalities from one motor-driven actuating member and for actuating the alphabet printing instrumentalities from another separate and distinct motor-driven actuating member. A further object of my invention is to provide means for preventing a false operation of parts of the mechanism under certain peculiar and unusual conditions of use of the machine, and which false operation if permitted to occur might result either in tying up the machine or in a failure to carry the amount into the register.

Still another object of my invention is to construct the machine having the foregoing characteristics in two separate units, one of which may be readily displaced or detached from the other without interference from coacting parts carried by the two units, and in which the two units may be as readily brought together and the cuacting parts thereon properly correlated and the machine conditioned to function.

Another object of my invention is to provide.

improved automatically operating means for locking the computing mechanism against acruation when the tabulating mechanism is actuated and also when the power-driven carriagereturn mechanism is rendered effective to return the carriage.

A further object of my invention is to provide eflicient means for insuring maintenance of each of the controlling cams in its normal position and for insuring maintenance of the associated locking pawl out of cooperative relation with its companion driving wheel when the parts are in a position of rest.

To the abowexand other ends which will hereinaiter appear my invention consists in the features of construction, arrangements of parts and combinations of devices set forth in the following description and particularly pointed out in the appended claims.

In the accompanying drawings, wherein like reference characters designate corresponding parts in the difierent views,

Fig. 1 is a fragmentary, vertical, fore and aft sectional view of a portion of.a machine embodying my invention.

Fig. 2 is a fragmentary, detail side view of one of the alphabet printing type actions and a portion of the power-driven means by which it is actuated, with the parts shown in the normal position. I

Fig. 3 is a like view of the same with the parts shown in the actuated position.

Fig. 3' is a like view of the same showing the parts as they appear when the actuated type bar and connected parts have returned to normal position, but the actuated key' lever is held depressed by the operator. Q Fig. 4 is a fragmentary, side view of one of the numeral printing type actions and the power-driven means for actuating it and the computing mechanism, the parts being shown in the normal position.

Figs. 5 and 6 are like views of the same showing the parts as they appear at different stages in the operation.

Fig. '7 is an enlarged, detail, fragmentary side view of one of the trip devices by which a numeral printing type bar is actuated.

Fig. 8 is an enlarged, detail, fragmentary,

perspective view of a group of the controlling cams and some of the associated parts.

Fig. 11 is an enlarged, detail, top plan view of the same.

Fig. 12 is an enlarged, detail, fragmentary, top plan view of one of the actuating arms.

Fig. 13 is an enlarged, detail, fragmentary sectional view showing one of the operating cams and the means for mounting it and the associated driving wheel on the supporting or driving shaft.

Fig. 14 is an enlarged, detail, fragmentary, central, vertical, fore and aft sectional view showing a portion of one of the type actions and some of the associated parts.

Fig. 15 is a like view showing the fulcrumed end portions of the type action controlling levers and some of the associated parts.

Fig. 16 is an enlarged, detail, fragmentary, top plan view of the controlling cams, the snatch roll and the driving connections therefor.

Fig. 1'? is a fragmentary, side view of the machine, partly in section and showing the driving connections illustrated in Fig. 16 and the connection to the motor.

Fig. 18 is an enlarged, detail, side view, with parts in section, of the computing mechanism with parts omitted.

Fig. 19 is a like view of a portion of the same, shown on a smaller scale.

Figs. 20 and 21 are fragmentary, detail, perspective views of portions of the lock for the actuator of the computing mechanism.

Fig. 22 is a fragmentary, detail, side elevation showing a portion of the tabulator and poweractuated carriage-return mechanisms and the means for controlling the lock for the actuator of the computing mechanism therefrom.

Fig. 23 is a fragmentary side view of the machine, with parts omitted, showing the upper frame section swung back on the base frame.

Fig. 24 is an enlarged, detail, side view of one of the pawl carrying controlling levers and its pawl employed in the alphabet printing type actions.

Fig. 25 is a like view showing one of the actuating pawls for an alphabet type action and a portion of the actuating lever it controls.

Fig. 26 is a detail, perspective view of one of the hinges by which the two frame sections are connected.

Fig. 27 is a bottom plan view of the centrally disposed supporting means for the cam carrying shaft and some of the associated parts.

Figs. 28 and 29 are enlarged, detail side view of parts of the actuating means for the computing mechanism, showing the parts as they appear at different periods in the actuation thereof.

Figs. 30 and 31 are enlarged, detail, diagramtmatic side views illustrating the manner in which false operations of parts of the computing equipped with computing mechanism similar to,

that disclosed in the patent to Wahl No. 1,- 270,471 dated June 25, 1918. While the devices of my present invention may be incorporated in such a machine without materially modifying many of the existing structural features there f,

and it is one of the objects of my invention to attain this end, it should be understood that I am not restricted in the use of the invention to any particular character of combined typewriting and computing machine, but that it may be employed wherever found available.

In the present instance I have shown the machine equipped with carriage-return mechanism actuated by a constantly running motor as disclosed in my companion application filed May 20, 1931 bearing Serial No. 538,725.

In the accompanying drawings I have shown only so much of the No. 23 Remington accounting machine and the carriage-return mechanism of my said application Serial No. 538,725, as is necessary to arrive at an understanding of the features of my present invention in their combination therewith.

In the present embodiment of the invention I prefer to include the mechanism in two units, in one of which the parts are carried by a frame I (see Fig. 23) that is the same as the frame of the No. 23 Remington accounting machine with its corner posts I, top plate, etc., whereas the parts of the other unit are carried by a second frame 2 that constitutes a base on which the frame I rests and to which it is pivotally and detachably united. The coacting working parts carried by the two frames I and 2 are so related that the upper frame I may be swung on the base 2 to, and maintained in, the position shown in Fig. 23 in order to give access to the parts contained within the frame I at the lower portion thereof, and also to give access to underlying parts contained within the base frame 2. the frame I is again lowered on the base frame 2. the said coacting parts on the two frames will be brought into cooperative relation ready to function, as will hereinafter more clearly appear.

Any suitable means may be employed to detachably connect and hinge the two frames I and 2 together. In the present instance I employ two hinges each comprising the sections 3 and 4 united by a spindle or pivot 5, as shown in Fig. 26. Each section 3 is secured to the base of the frame I at the rear thereof, whereas each section 4 is secured to the lower frame 2, and the two sections are pivotally united by a spindle or pivot 5 that is received with a drive fit in the section 4 and has a loose fit in the companion section 3. By driving the spindles 5 out of their drive fit bearings the two frames I and 2 may be detached one from the other, if desired.

I prefer to employ a dowel pin 6 in each side of the base of the frame I, said dowel pins being received in corresponding openings Ii in each side of the lower frame 2 when the frame I is lowered into position and supported on the frame 2.

In the machine, as shown, various driving devices are employed which are driven from a constantly running electric motor I, as best shown in Figs. 1, 16, 17 and 23. The motor I is de tachably secured to a bracket 8 which in turn is detachably secured to the frame 2 at the rear thereof. The driving devices in question include a tooth-bearing snatch roll 9 fixedly mounted to turn with a motor-driven shaft I0, and a series of independently operable controlling cams I2 loosely mounted on but adapted to be selectively coupled with a motor-driven shaft I 8,

as will hereinafter more clearly appear.

The shafts I0 and I3 are preferably mounted on ball bearings, as shown in Fig. 16, and at the right-hand side of the machine said shafts extend beyond the frame 2 where they are pro- When vided with driving pulleys I4 and I5 respectively. A worm gear I8 is fixed on the shaft I3 and meshes with a worm pinion II fixed on a short driving shaft I8 mounted to turn in a bearing in the base frame 2. The outer end of this shaft carries a driving pulley I9 from which motion is transmitted to the shaft I3. The motor shaft 20 carries a driving pulley 2I over which a driving belt 22 passes to the pulley I9 and thence to a driving pulley 23 carried by a rear corner post I of the frame I to operate the carriage return mechanism, as will hereinafter appear. The belt 22 in passing from the pulley 2I to the pulley I9, coacts with a take-up pulley 24 mounted on an arm 25 pivoted at 26 to a bracket arm 21 fixed to the frame 2. This arm is pressed upward by a spring 28 to take up any slack in the driving belt 22.

The pulleys I4 and. I5 are connected by a driving belt 29 that receives downward pressure from a take-up pulley 39 mounted on an arm 40 pivoted at H on a side of the frame 2 and pressed downward by a spring 42 to take up slack in said belt 29. a

Motion is thus transmitted from the motor shaft to the cam-carrying shaft I3 and from the latter to the snatch roll 9 so that they operate in unison but at the proper ratio, the shaft I3 turning at, say, two and one half times the speed of the snatch roll shaft III in the present instance.

In order to provide a protection against the operator coming into contact with the motor and driving mechanism described above, 'which is outside the frames 1 and 2, I prefer to employ a housing 43 which entirely encloses said parts and is shown in section in Fig. 17. This housing is detachably connected to the frames I and 2, and when employed must first be removed before the frame I and the parts carried thereby can be swung back on or detached from the lower or base frame 2. It also is necessary or advisable to first remove the belt 22 from the pulley 28.

Of course it will be understood that so far as some of the more important features of my invention to be hereinafter described are concerned, the separable or detachable units and the housing hereinbefore described may or may not be employed.

The snatch roll 9 is provided with teeth 9 which extend throughout the length thereof and from side-to-side of the base? frame 2. This snatch roll is provided to operate on connections by which the alphabet printing instrumentalities alone are actuated, the numeral type bars and computing mechanism being controlled from the cams I2 as will presently appear; such cams having no control of the alphabet printing type bars. I will first describe the manner of operating the alphabet printing type bars from the snatch roll.

Referring more particularly to Figs. 1, 2, 3, 9 and 15 of the drawings, it will be seen that substantiaily horizontally disposed alphabet key levers 44 extend in fore and aft, vertical, parallel planes and are all fulcrumed at their rear ends on a common fulcrum bar 45 carried by the frame I. A contractile returning spring 48 is connected to each of said key levers and is provided with the usual adjusting screw 41 to vary the tension thereof. Each key lever 44 carries a depending arm 48 that terminates in a laterally extending lug 49. Said arms are guided by a guide comb 50 carried by brackets 5| secured to each side of the frame I but maintained spaced apart therefrom. Each lug 49 coacts with an angular trip-carrying lever 52, shown in Pivoted at 58 to each lever 52 is a trip pawl- 59 provided with an opening BII'therein through which a stop pin BI on the associated lever 52 extends, as shown in Fig. 24, thus providing stop surfaces to limit the movement of each pawl relatively to its carrying lever. Each pawl 59 is provided with a hook-like end 62 and is connected by a spring 63 with the companion carrying lever 52. The hook-like end 52 of each trip pawl coacts with an upwardly extending projection 54 on a companion engaging or actuating pawl 65. shown in detail in Fig. 25. Each pawl 65 is pivoted at 56 on the depending forward end portion 51 of a substantially horizontally disposed type bar actuating lever I58 parallel with and interspersed between the key levers 44. There is one lever 88 for each alphabet key lever and they are all fulcrumed on the common fulcrum bar 45 in the rear of the machine, each lever 68 being connected to a returning spring 69 having an adjusting screw III,

as indicated in Fig. 15. Each of the levers 68 is provided with a depending projection II. Upon reference to Fig. 15 it will be understood that each projection 'II coacts with a universal bar I2 mounted and functioning in the usual man-- is provided with stop devices similar to those employed on the parts 52, 59. Thus, each pawl 65 has an enlarged opening I3 therein for the reception of a stop pin I4 carried by the companion part 61 of the lever 68 to which said pawl is pivoted. These stops limit the movement of the hook-like lower ends I5 of the pawls away from the teeth of the snatch roll 9 under the force of the contractile springs 16. Each of said springs I6 is connected at one end to a pawl 65 and passes through an opening ii! to the opposite side of the companion part 61 where the other end of the spring is secured. M

3 The lower end portion of each engaging pawl 65 is guided in a guide slot of a guide comb 11 secured at its ends to depending arms of the brackets 5|.

Referring to Fig. 1, it will be seen that each of the levers 58 carries an upwardly extending projection I8 that carries a pin I9. Said pin operates in the usual manner in a slot 80 of a sub-lever 8|, pivoted at 82 and operatively connected at its upper end with an alphabet printing type bar 83. All of the type bars are pivoted as indicated at 84 (see Fig. 14) to a type bar segment 85 in order to swing upwardly and rearwardly to the printing point and make an imprint against the platen 95,'or the paper thereon, through the usual ribbon, not shown. As each type bar approaches the printing position a contact 81 thereon coacts with a universal bar 88 (see Fig. 28) to move the latter and control the escapement mechanism to effect a letterspace movement of the carriage (not shown) and the platen 86 carried thereby.

So much of the type actions as includes the sub-levers BI, the type bars and the manner of mounting the same, the carriage construction, the carriage feed mechanism, the ribbon control mechanism, etc., are, or may be, of the usual construction employed in standard Remington machines.

The effect of depressing an alphabet key 44 from the normal Fig. 2 position, is to turn the associated lever 52 in an anti-clockwise direction on its pivot 53 until said lever is arrested by an adjustable screw stop 52 normally held in a fixed position by a locking screw 52. This results in throwing the engaging portion 15 of the companion pawl 65 into the path of the teeth 9 of the constantly running snatch roll 9. When the pawl 65 is thus engaged by the snatch roll it will be carried down as indicated in Fig. 3, thereby actuating the companion lever 68, sublever 9i and type bar 83. The parts will continue this movement until the type bar is positively moved to a distance of about one and one quarter inch from the platen when the pawl 65 is disengaged from the snatch roll and the type bar continues its movement to the printing position by its own momentum and that of the parts connected therewith. When the pawl- 65 is engaged by the snatch roll, it will continue its downward movement until the cam edge 89 on the pawl is driven against an adjustable fixed abutment in the nature of a screw 90 held in its adjusted position by a holding screw 9|. As the pawl continues to descend it will be cammed out of engagement with the snatch roll 9. Fig. 3 shows the parts just prior to the time such disengagement is efiected and Fig. 3 shows the position of the parts after the actuated type bar and its actuating lever 68 and pawl 65 have been returned to normal position by the companion spring 69 and while the associated key lever 44 s still maintained depressed by the operator. From this last mentioned view it will be seen that the bottom of the nose or engaging end 62 of the actuated trip pawl 59 is on top of and will ride back on the top of the companion projection 64 and drop to the rear thereof when the operator releases the actuated key lever 44, thus reestablishing operative connection between said key lever and the companion actuating pawl 65. It follows, therefore, that no repeat operation of a type bar can take place until after the depressed finger key is released and has been returned substantially to its normal position. It also will be observed that the engaging portion 62 of each releasing pawl 59 can never move to a position where it is in front of the companion projection 64.

It follows from the foregoing construction and arrangement of parts, not only that no repeat operation of the type action can take place due to holding the key down, but that there is no shock transmitted to the operators finger in the actuation of the type bar from the snatch roll. This last mentioned effect is due to the fact that the key lever 44 merely moves the actuating" pawl 65 into the path of the teeth on the snatch roll, and that the movement of said pawl by the snatch roll is downwardly away from the companion pawl 59 so that no shock is transmitted to the latter or to the operators finger which is holding said pawl in the actuated position.

I will now describe the operation of the computing mechanism and the numeral printing type bars, it being understood from what has been said above that the alphabet printing type bars are actuated without having any effect on the computing mechanism.

It has been explained that the actuation of the computing mechanism and numeral printing type bars is under control of the power-driven cams I2. As shown in Fig. 13 each of these cams is mounted on bearing balls 92 received in a V-shaped bearing groove in the cam and between relatively adjustable cone bearings 93 and 94, a lock nut 95 holding the cone bearings in their positions of relative adjustment. Each cone bearing 93 is formed as an integral part of a locking or driving wheel 96 the hub 91 of which is fixed to the driving shaft I3 by a pin 98. The ends of the the teeth 99 of each locking wheel 96 are preferably flat, and they are separated by interdental spaces I having substantially parallel side walls as shown in dotted lines in Fig. 4 and in Fig. 10. Pivoted at IN on one side of each of the cams I2 is a locking pawl I02 that has a squared engaging nose I03 that fits in any of the spaces I00 of the companion locking wheel and effectively locks the associated cam to said wheel to turn therewith and with the shaft I3 that carries it. A spring I04 is connected to each locking pawl I02 and exerts its force to move the engaging nose of the pawl towards the assoc'ated locking wheel 96 and into one of the spaces I03 thereof. Should the engaging nose of the pawl happen to rest on the end of a tooth 99 of the wheel, as shown in Fig. 4, when the pawl is thrown towards the wheel by its spring, then as the first space I00 of the rotating wheel reaches said nose the latter will be forced into the space, locking the cam to turn with the driving shaft I3.

Means are provided whereby at each depression of a numeral printing key the corresponding cam I2 will be locked to turn with shaft I3 as above described, but for a single revolution only of the cam and the latter will thenbe automatically released. Such means will now be described.

Referring more particularly to Figs. 1, 4, 5, 6, 10 and 27 it will be seen that each pawl I02 has a projection I05 that in the normal position of the parts, shown in Fig. 1, coacts with an antifriction roller I06 on a trip lever I01 to hold the associated pawl I02 against the force of *its spring I04 and disengaged from the companion locking wheel 96. Each lever I0I is pivoted at I08 on a hanger arm I09 secured to a cross bar III! by screws III. The bar H0 is provided at its ends with feet II2 by which it is secured by screws II3 to the base frame 2. The lower end portion of each lever I0! is guided in a slot in a guide comb I I5 and is limited in its clockwise movement by coacting with the end wall of its guide slot, as shown in Fig. 1. A contractile spring II 6 is connected at one endto each lever I01, the opposite end of each spring being anchored to a flange III provided at the forwar edge of the guide comb I I5. The guide comb I I is secured by screws I I8 (Fig. 5) to the cross bar H0 and in turn supports depending posts II9 (Fig. 1) by which a supporting frame. designated as a whole by the reference numeral I20, is supported. The rear end of the supporting frame I20 is secured by screws I2I to a second cross bar I22 corresponding to cross bar H0 and secured at its ends in a like manner to the side members of the frame 2. The supporting frame I20 and associated parts are best shown in Figs. 1 and 2'7, from which it will be seen that upstanding side members I23 on the supporting frame provide supports for two pairs of bearing rollers I24 located intermediate the ends of the shaft I3 and beneath the same, one roller I24 of each pair being located forward of the axis of the shaft and the other inthe rear thereof. These rollers coact with the hubs 91 of two of the locking wheels 96 to provide an antifriction supportfor the shaft intermediate its ends, to resist downward thrust on said shaft from the pressure of spring-pressed actuating members that coact with the cams I2, as will hereinafter appear.

Reverting again for a moment to the trip levers I01 it will be seen that an upwardly and-forwardly extending arm I25 on each of them has a shoulder or engaging portion I26 adapted to be engaged by a laterally projecting lug I 21 on a depending arm I28. This is in order to shift the companion trip lever I01 to the ineffective position, shown in Fig. 4, and free the associated pawl I02. This enables the pawl I02 to lock its cam I 2 to the companion locking wheel 96 during a period of one revolution only of said wheel, as will hereinafter appear. The upwardly extending end portion I25 on each arm I25 prevents the associated lug I21 from moving rearward of the companion arm .I25 and aids in bringing the members I21 and I26 in proper correlation when the frame I is moved down on the frame 2 from the Fig. 23 position.

Each of the arms I28 is pivoted at I29 to its associated key lever I30. The key levers I30 are provided with keys I30 and are those which control the printing of the numerals and the actuation of the computing mechanism. Such levers I30 correspond to the key levers 44 except that the former are devoid of the arms 48 and are provided with the pivoted arms I28. The key levers I30 are interspersed among the levers 44 and 68 in like parallel arrangement, and are fulcrumed on the common fulcrum bar 45 and are provided with returning springs like the springs 46. Associated with each key lever I30 and arranged adjacent thereto and parallel therewith is a lever I3I fulcrumed on the bar 45 and provided with a depending portion I32 slotted at I33 to receive a pin I34 projecting laterally from a 2 to their actuating levers 68. Thus, by referring to Fig. 4, for example, it will be seen that each lever I3I has an upwardly extending projection I31 provided with a laterally extending pin I38 that engages in a slot I39 in an angular sublever I40 connected to the companion type bar in the manner hereinbefore described.

Referring once more to the trip levers I01 and the manner of controlling them andthe control of the pawls I02 thereby, it will be seen that the upper end of each of the arms I28 is connected to one end of a contactile spring I28 connected at its opposite" end to a pin I on the associated key lever 130. The force of each of.

these springs I28 is exerted to normally hold the companion I28 against a stop pin I42 carried by the associated key lever, as shown in Fig. 1.

As a key lever I30 is depressed to the Fig. 4 position it results in turning the companion lever I01 in an anti-clockwise direction until the latter is arrested by a stop pin I43 on the associated hanger arm I09, and the pawl I02 which was held by said lever I01 has been released. At about this time the parts assume such aposition that the lug I21 on the arm I28 will slip ofl and disengage the shoulder I26 on the actuated lever I01, thereby releasing the latter from control of the depressed key lev'cr I30 and permitting an independent return of the lever I01 to normal position under the force of its spring II6. As soon as the pawl I02 has been released in the manner described, the projection I 05 thereon will drop to a position where the roller I06 cannot return to the front of said projection even in the event that the nose I03 of the locking pawl drops on top of a tooth 99 of the companion locking wheel, as shown in Fig. 4, instead of in an interdental space I00 therein. When the locking pawl I02 effects a locking engagement with its-rotating locking wheel 95, the companion cam I2 will be sults in carrying the pawl I02 around with the locked cam and carrying it in an anti-clockwise direction away from the actuated lever I01 which is immediately returned to normal position, as shown in Fig. 5, preparedto coact with the pro- J'ection I05 and release the looked pawl from its locking wheel 96 when the latter completes one revolution.. The parts will then again be in the Fig. 1 position assuming the depressed key lever I30 has been released by the operator. However,

should the operator hold the key I30 depressed, as indicated in full lines in Fig. 6, the actuated lever I01 will, nevertheless, have returned independently thereof to normal position tocoact with the projection I05 of the companion pawl and release it; the parts at such time, other than the depressed key and the parts carried thereby, being in the Fig. 1 position.

It follows from what has been pointed out above that each depression of a numeral printing 'key I30 will result in a single revolution only of the associated cam I2 from the powerdriven shaft I3, even though the actuated key be held depressed by the operator. From what follows it will be understood that it is necessary for the operator to permit the return of the depressed key substantially to its normal position before the same key can again be actuated to effect another revolution of its associated cam, although from aconsideration of the full and dotted line showing of one of these keys in Fig. 4, for example, it will be seen that the extent of such return movement is not very great. ,4

Having described the manner inwhich the cams I2 are selectively driven from the power shaft I3, I will next describe how motion is positively transmitted from said cams to the numeraleprinting type bars.

From an inspectlon of Figs. 1, 4, 5, 6, 7, 10, 11 and 12. it will be seen that there is provided a series of oscillatory actuating members I44, corresponding to the number of cams I2 employed, or which there are, in the present instance, eleven; one for each of the numeral printing type bars 0 to 9 inclusive and one for the usual pence key when themochineisequippedintheunmmannerior:

writing and computing English money. Each of the actuating members I44 is in the nature of a lever or arm pivoted to turn loosely on a fixed pivot rod I45 mounted at its ends in brackets I45 secured to the frame I. The members I44 are maintained spaced apart on the pivot rod by spacing sleeves I41 (see Fig. 10) each fixedly attached to the pivot rod by a set screw I48. Each member I44 carries a roller I49 pivotally supported on one side thereof, as indicated in detail in Fig. 8. From this view it will be seen that a headed pivot pin -I50 passes through a central opening I 5I in the roller I49, the reduced portion I52 of the pin providing a bearing for the roller and also being seated in an opening I53 in the arm I44. The still further reduced portion I54 of the pivot pin provides a bearing for a second, peripherally grooved roller I55 on the opposite side of the arm I44. A headed screw I56 is received in a tapped opening in the righthand end of the pivot pin I50 and holds the parts assembled. Each of the members I44 is equipped with such rollers I49 and I55, the former as previously pointed out bearing against its associated cam I2, whereas each roller I55 provides a bearing for one end portion I51 of a heavy spring I51. The opposite end portion I58 of each of said springs bears against a cross bar I 58 secured at its ends to the frame I. The portion of each spring I51 intermediate its ends is coiled around the companion spacing sleeve I41 on the pivot rod I45, as clearly indicated in Fig. 10. The force of each of these springs is exerted downward on the companion member I44, the movement of such member under the force applied by its spring being resisted by the associated cam I 2. The power of each spring I51 is sufficient to actuate the computing mechanism as will presently appear, but this spring is not required to actuate the companion numeral printing type bar, the latter being positively actuated by the companion cam I2 in returning the associated arm I44 to normal position against the force of its spring I51, as will presently more clearly appear.

Each member I44 extends forward of the pivot rod I45 on which it is mounted to provide a holding or tripping arm I60 that is adapted to cooperate with the companion depending arm I28. ,The purpose of this cooperation between each holding arm I60 and its companion arm I28 is to hold the latter against return movement into'cooperative relation with its trip lever I01 until the companion cam I2 has about completed its cycle. Thus, as the released cam I2 starts to turn from its Fig. 4 position it will permit its arm I44 to be lowered under the force of the companion spring I51 exerted thereon. As the low portion of the cam is approached the arm I60 will move into cooperation with and prevent a rearward movement of the companion arm I28, as will be understood from a consideration of Figs. 5 and 6, and will remain in some such obstructing position substantially until the cam I2 has completed its revolution and the arm I44 has been returned to normal position shown in Fig. 1. This insures a kicking and holding off of the arm I28 from its trip lever I25 to enable the latter to be immediately returned to a position where it will coact with and release the locking pawl I02 as the latter is carried around with the companion cam, and thus prevents reengagement of the arm I28 with its trip lever until the cycle of operations that result from a single revolution of a cam I 2 has been completed.

It has been pointed out that each of the cams I2 is mounted on ball bearings. So, therefore, when the cams in the normal position of the parts, shown in Fig. l, are disconnected from their locking wheels 96, said cams are free and may easily turn on their bearings in a clockwise direction. At this time the reactive force of each spring I04 on its associated cam would be effective to turn it in a clockwise direction, as the parts appear in Fig. 1, in the absence of some means to counteract such movement of the cam. This will best be understood when it is remembered that at this time the companion looking pawl I02 is held by its lever I01 in the released position and against the reactive force of the associated stressed spring I04 so that at this time such force is exerted to turn its companion cam I2 in a clockwise direction. Such a clockwise movement of a cam I2 at this time would result in a movement of the engaging nose I03 of the companion locking pawl I02 towards the teeth of the associated rapidly turning driving wheel 96. Even if the extent of this movement of the locking pawl should be insuificient to enable it to effectively engage the companion driving wheel, or to enable its engaging nose to pass into an interdental space therein, such movement of the pawl would result, nevertheless, in setting up a loud clatter in the machine due to the engaging nose of the locking pawl successively contacting with the ends of the teeth of the rapidly rotating driving wheel. In order to overcome this diirlculty I have provided on each cam I2 a high spot or slight elevation I2 which in the normal position of the parts, shown in Fig. l, is positioned just forward of the companion roller I49. The greater force of the spring I51 exerted against the roller I48 is effective with the aid of the high spot I2 on the cam to overcome the tendency of the weaker spring I04 to turn the companion cam in a clockwise direction from its normal position. Therefore, in the normal position of the parts each cam I2 will be accurately held in its normal position notwithstanding the tendency of its spring I04 to move it from such position and will prevent the associated locking pawl I02 from contacting with its rapidly rotating driving wheel. I regard this feature of considerable importance in the production of a successfully operating machine of the character disclosed herein.

It has been explained above that the actuation of a numeral printing type bar does not take place until after the completion of the computing operation and during the return movement of the associated arm I44 under control of its cam I2. While out of order in the successive operations of the parts, I prefer at this point to describe the remainder of the means for efl'ecting such numeral printing because of its Simplicity and the little that need be added to what has been hereinbefore described.

As best shown in Figs. 1, 4 to 8, and 12 it will be seen that each member I44 at its free rear end has an enlarged portion I44 to which a one-way trip lever IBI is pivoted at I52. This trip lever carries an antifriction roller I53 at the upper end thereof for cooperation with its companion actuating lever I34 by which the corresponding type action is controlled, as hereinbefore described. A block I64 (Fig. 7) on the left-hand side of each arm I44 is riveted thereto at I65 and is tapped to receive an adjustable screw stop I 66, the upper end of which coacts with an edge I51 of the companion trip lever I8I to limit its motion around its pivot I62 in one 

